Sash-fastener.



No. 892,537. l PATBNTED JULY?, 1908.

W. J. MITCHELL.

SASH PASTBNER.

APPLICATION FILED JAN. 21. 190B.

UNITED STATES PALEENT OFFIQE WILLIAM JOHN MITCHELL, OF MELROSEHIGI'ILANDS, MASSACH.USICTTS, ASSIGNOR OF ONE- HALF TO NEl'IIillL/XI'ISMITH, OF MELROSE IIIGIILANDS, MSSAUI'IUSICTTS.

SASH-FASTENER.

Application led January 21, 1908.

To all whom it may concern:

Be it known that I, WILLIAM JOHN Miroir- ELL, a citizen of the UnitedStates, residing at Melrose Highlands, in the county of Middlesex andState of Massachusetts, have invented a new and useful Sash-Fastener, ofwhich the following is a specification.

This invention relates to sash locks, and

has for its object to provide means whereby an upper or a lower windowsash, or both, may be opened a short distance and be securely locked insuch position against all outside efforts to further open the window.This result is accomplished by a simple, cheap, and easily operateddevice to be fastened on the upper side of the top rail of the lowersash at either side and engage the upper sash, the adjacent side of thewindow frame, or both.

Vith this and other objects in view, the invention comprises the novelconstruction, combination and arrangement of parts hereinafterdescribed, claimed and illustrated in the accompanying drawing forming apart of this specification in which- Figure l is a perspective v iew ofthe improved sash lock applied to a window, a part only of the windowbeing shown. Fig. Z is a horizontal sectional view of the sash lockenlarged and detached from the window. Fig. 3 is a sectional view on theline 3-3 of Fig; 2, Fig. l is a bottom plan view of the casing, withoutthe locking bolts, and Fig. 5 is a perspective view of one of thelocking bolts.

Similar reference characters are used for the same parts on all thefigures.

A indicates the lower sash, B the upper sash and O the window frame.Fastened to the upper side of the top rail of the lower sash A and atone side thereof close to the window frameO is the sash fastener Dconsisting in this instance of a casing l, secured to the lower sash byscrews 2, through which casing two locking bolts 3 and 4 are adapted toslide and engage respectively an opening in the upper sash B and one inthe window frame O.

The casing .l is substantially square in plan view and reaches acrossthe sash rail from its inner to its outer side. Three sides of thecasing are straight, but the side adjacent the window frame is ofirregular formation, it having a curved indentation 5 to receive thesash cord and an angular inset 6 at the outer rear corner to extendaround the parting Specification ol. Letters Patent.

bead.

Patented July '7, 1908.

Serial No. 411,952.

Diagonally across the casing from the inset (i the corner 7 of thecasing is eut away at an angle fora purpose to be described later.

Formed in the under side of the casing l are two curved grooves S and Elin which the respective locking bolts 3 and -l slide when moved into andout of engagement with the upper sash and the window frame. The groovesS and S) open, respectively, on the sides of the easing next the uppersash and the window frame, and curving towards each other they imitebefore reaching the angular corner 7 into a single groove ll), equal inwidth to the two grooves.

The locking bolts 2% and L/lare alike in ronstruction and form, but theyare opposilely curved as represented in Fig. 2. Each locking bolt has alocking end ll preferably of cylindrical form which is projectedoutwardly to engage an opening in the window frame or upper sash when itis desired to lock the sash in either open or closed position. Theremaining portions l2 of the locking bolts are rectangular in crosssection with llat operating 'lingers l?) curved on their upper edges andprojecting from the inner end of each bolt. Near the locking ends ll ofthe bolts are shoulders 14 designed to abut against a shoulder .l5 inthe wide groove l() of the casing, see Fig. 3, and prevent thewithdrawal of the bolts from the easing.

The window frame (l has two openings 1G, preferably bushed with metal toprevent undue wear. The openings in the upper window sash are formed. ina metal plate 17 screwed to the face of the sash and llush therewith.The lower hole in the upper' sash and in the window frame, which are notshown, are used for locking the window when closed. The other opening 1Gin the window frame will receive the locking bolt l when the lower sashis raised. When the upper sash only is to be opened, the locking bolt 5will be engaged with the central perforation v1S in the plate 17, but ifboth upper and lower sash are to remain open' the bolt 3 will enter theupper perforation 1S) in the plate 17. To prevent the bolts 3 and -lfrom wearing the wood sash, a thin metal plate 20, preferably of thesame size and outline as the casing, is fastened to the sash by thescrews 2 which hold the easing in place.

A sash lock constructed as above dcscribed, will permit the windows of ahouse to be opened for ventilation and securely locked against furtheropening from the outside while the tenants of the house absentthemselves. The sashes are not to be opened wide enough to admit rain sothat no attention need be paid to the windows during rainy weather. A i

The fingers 13 are ilattened on their sides and curved on their upperedges to prevent the windows being forced through the medium of a bentwire engaging the upper edgeY of either locking bolt back of the inger.Willen made as described the curved upper edge of the linger gives nohold for a bent wire or other object which may be used in an attempt toopen the window.

I claim l. A sash lock comprising a casing having two curved groovestherein and a curved lock bolt slidable in each groove, provided with anoperating iinger arranged for independent or synchronous operation.

2. A sash lock comprising a casing having two curved grooves therein andcurved independently operative locking bolts slidable in said grooves,each bolt having an operative linger in close proximity to the other andadapted to be projected at their locking end at a right angle to eachother, said operating ingers being adapted to be simultaneously graspedby the iinger and thumb of one hand.

3. A sash lock comprising a casing having two curved grooves thereinjoined together at one end into a single groove, curved independentlyoperative locking bolts slidable in said groove their locking ends at aright angle to each other and adapted to engage the one in openings onthe upper sash and the other in openings in the window frame when saidcasing is attached to the top of the lower Mssh.

4. A sash lock comprising a casing having two curved grooves in theirunder side oining each other at one corner of said casing, a curvedindependent locking bolt slidable in each groove, one end of each boltemerging Jfrom the casing at said corner adjacent each other and havinga flattened operating inger with a curved edge, and a wear plate on thebottom oi said casing below said locking bolt.

5. A sash lock comprising a casing having two` curved grooves in itsunder side joining each other at one corner of said casing to form awide groove with a shoulder extending across the same, a curvedindependent locking bolt slidable in each groove and emerging from saidwide groove side by side and having each an operating iinger and ashoulder adapted to engage the shoulder in the groove and limit themovement of the bolts in one direction.

In testimony that I claim the foregoing as my own, I have hereuntoaHiXed my signature in the presence of two witnesses.

VILLIAM JOHN MITCHELL.

Vitnesses:

GEORGE W. BURKE, NEHIMIAH W. SMITH.

